Drill Press RPM for steel

[R W]

How about the motor. Does it ever overheat.

really it is not bad to use at all, and in some instances it is easer to and less fatiguing to use than a electric drill, there is a nut that puts the down pressure on the bit and if you do not get carried away it is simple easy and fast, helps to have polite hole pre drilled, tho,[/QUOTE]

With a good quality drill bit & a pilot hole they are easier than a hand held electric
for 1/2" and over.

 

[R W]

Those polite holes are so nice. They always say please and thank you.

Sorry, I just couldn't resist giving you crap over that one.

Seriously, though; one of those hand drills would be VERY handy. I wonder if a guy could still buy one somewhere.

Try Ebay.

 

[JB4310]

Is there any way to slow the electric motors down?

Like a dimmer for a light, or would that reduce the motors power?

JB

 

[grsthegreat]

Is there any way to slow the electric motors down?

Like a dimmer for a light, or would that reduce the motors power?

JB

yes..and no. For single phase motors you can use a motor speed control unit. I have one on my bench grinder. problem you HAVE to remember to have it fully on when you start up the motor..or you could cause some damage. Ive never seen anyone put one on a drill press...but i dont see why it wouldnt work. and O a dimmer switch wont work, the motor speed control needs to be sized to the drills amperage.

my drillpress has like 16 speeds so it has never been an issue.

3 phase motors can use a frequency drive....these are used all the time for large motors.

 

[Iplayfarmer]

Is there any way to slow the electric motors down?

Like a dimmer for a light, or would that reduce the motors power?

JB

This ought to do it... Router Speed Control

I'm sure there are options available from other suppliers besides Harbor Freight.

 

[JB4310]

yes..and no. For single phase motors you can use a motor speed control unit. I have one on my bench grinder. problem you HAVE to remember to have it fully on when you start up the motor..or you could cause some damage. Ive never seen anyone put one on a drill press...but i dont see why it wouldnt work. and O a dimmer switch wont work, the motor speed control needs to be sized to the drills amperage.

my drillpress has like 16 speeds so it has never been an issue.

3 phase motors can use a frequency drive....these are used all the time for large motors.

I knew it was not the same as a dimmer, but the same concept.

Do you lose power with a motor speed control, and where do you get them?

My taiwan drill pres has multi speeds but the slowest is ~600 rpm's and I know exactly what these guys are talking about, too fast for larger holes in thicker steel. I have to bring those jobs to my buddies machine shop, he's got some crazy old school machines.

He slows the drill press way way down for me to drill my holes.

JB

 

[SPYDERLK]

********************************************************
You better believe it will work so buy it if the price is reasonable. Those don't come around for sale very often. I wouldn't be without one.

RPM is determined by cutting speeds of various materials and those recommendations are all over the place depending on who's chart is being used.

For mild steel 90 feet / minute was once popular but I see now 100 ft./ min. is being used and even higher.

In the link below is the old formula that don't need no stinken pie to figure RPM.
Simply multiply the material cutting speed X 4 and divide that by your drill bit diameter. Using 100 ft./ min. cutting speed you can readily see your 1" HSS bit can be rotated 400 rpm. A coolant fluid or cutting oil for cutting (NOT LUBRICATING OIL) is always recommended.

Safety Tip - always clamp your work securely to the press table via vise, C-clamps etc.

Machine Shop 2 - Lathe Cutting Speeds - RPM Calculations

HA! Under what conditions. Achieving acceptable performance at that rpm at that size would require a rigid, positive feed/rev, forced coolant setup. Not someting youll achieve by hand.
larry

 

[grsthegreat]

heres what my little old Delta has..and its about 10 years old. Model is still made..

 

[JB4310]

This ought to do it... Router Speed Control

I'm sure there are options available from other suppliers besides Harbor Freight.

Wow! seems to easy. Any reason that wouldn't work for a drill press?

JB

 

[grsthegreat]

My only concern with a speed control, is its going to reduce the torque and power of the motor also. If a simple dial control would /could control a drill press they would be using these instead of a series of pulleys.....just to save $$$

when i slow down the speed of my grinder, its way easier to bind up the disk during grinding...less POWER. so if you did this to a drill press, it might not be able to actually drill thru the steel????